Suppose you have 2 vertices (points) – 1 red and 1 blue – how many ways can you join them together? There’s only way to do it, which is to draw a line between the 2 points.
Cayley's formula - Wikipedia
A labeled ternary tree for labeled k-ary trees is the same, as a power
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Cayley's Formula – How many trees can you make from n labelled vertices? – TOM ROCKS MATHS
Video_49: Number of Labelled Trees on n Vertices Part 1
Total number of Spanning Trees in a Graph - GeeksforGeeks
PDF] The enumeration of labelled spanning trees of Km, n
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A Visual Telling of Joyal's Proof Of Cayley's Formula
PDF] A Refinement of Cayley's Formula for Trees
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Cayley's Theorem: Enumeration of Graphs